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The LG 34UC98-W only supports charging via the powered USB port on the back of the display, not via the thunderbolt ports. I did also try to use a USB to USB-C adapter cable to use that powered port to charge my MacBook but there is not enough power output from that port to charge the MacBook Pro.

I don't think Thunderbolt 2 which is what LG 34UC98 is using does any power out much less 87W which is what MacBook Pro 2016 needs. Even the newer LG 38 Inch monitor with USB-C support does not output 87W and cannot charge MacBook Pro 2016.